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DIFFRACTIVE OPTICAL ELEMENTS WITH VARYING DIRECTION FOR DEPTH MODULATION

  • US 20170031171A1
  • Filed: 07/30/2015
  • Published: 02/02/2017
  • Est. Priority Date: 07/30/2015
  • Status: Active Grant
First Claim
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1. An optical system, comprising:

  • a substrate of optical material;

    a first diffractive optical element (DOE) disposed on the substrate, the first DOE having an input surface and configured as an in-coupling grating to receive one or more optical beams as an input; and

    a second DOE disposed on the substrate and configured for pupil expansion of the one or more optical beams along a first direction,wherein at least a portion of the second DOE includes two or more regions in which a depth modulation direction is constant within a region and changes at each transition between regions, the depth modulation direction described by a steepest change of grating depth in the second DOE.

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